post/cpu/ppc4xx/fpu.c

   1 /*
   2  * (C) Copyright 2007
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * Author: Sergei Poselenov <sposelenov@emcraft.com>
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <config.h>
  27
  28 #ifdef CONFIG_POST
  29 #if defined(CONFIG_440EP) || \
  30     defined(CONFIG_440EPX)
  31
  32 #include <asm/processor.h>
  33 #include <ppc4xx.h>
  34
  35
  36 int fpu_status(void)
  37 {
  38         if (mfspr(ccr0) & CCR0_DAPUIB)
  39                 return 0; /* Disabled */
  40         else
  41                 return 1; /* Enabled */
  42 }
  43
  44
  45 void fpu_disable(void)
  46 {
  47         mtspr(ccr0, mfspr(ccr0) | CCR0_DAPUIB);
  48         mtmsr(mfmsr() & ~MSR_FP);
  49 }
  50
  51
  52 void fpu_enable(void)
  53 {
  54         mtspr(ccr0, mfspr(ccr0) & ~CCR0_DAPUIB);
  55         mtmsr(mfmsr() | MSR_FP);
  56 }
  57
  58 #endif
  59 #endif /* CONFIG_POST */